reset check engine light is on
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1991 Toyota Land Cruiser Question: reset check engine light
Answer #1patrick mannion from Greg Solow's Engine Room, May 05, 2010, 23:20Master
If the Check Engine light is on the computer in your car sees a fault with the emission control system. If the fault has been corrected (say the gas cap was loose and you tightened it the car goes through a particular drive cycle (it may take a week or two) and if it sees no fault it will turn the light of itself, otherwise you need a scan tool to turn off the light, it attaches to a 16 pin diagnostic socket under the dash.